Electrolytic cell cathode with zero polar spacing

ABSTRACT

The invention provides an electrolytic cell cathode with zero polar spacing, which comprises a conductive column; a cathode net connected to the conductive column; an elastic net covering the cathode net; a surface net covering the elastic net; a fastening part penetrating through the surface net, the cathode net and the elastic net and is fixed on the conductive column. According to the electrolytic cell cathode provided by the invention, in the using process, the elastic cathode is uniformly attached to the ionic membrane, so that the shaking of the ionic membrane is reduced in the using process, and the service life of the ionic membrane can be greatly prolonged. The elastic net with special structure can effectively prevent the elastic change caused by pressure fluctuation and keep the polar spacing relatively stable. In the process of discharging gas, bubbles can be broken and the resistance inside the electric tank can be reduced. The elasticity of the elastic net is better and more durable, and the current density is uniform.

TECHNICAL FIELD

The present invention relates to an electrolytic cell, in particular to an electrolytic cell cathode with zero polar spacing or gap.

BACKGROUND ART

There are 128 elastic four-claws distributed on the cathode plate of an electrolytic cell to support the pole net, and the four-claws are welded to the pole net. The center of the elastic claw is provided with a pit or depression for hold a cylindrical pin with a PFA cap. During operation, under the action of 32 mandrels, the cathode plate and anode plate are tightly attached back to back, and the cathode plate bottom contacts the composite conductive block on the anode plate, and then electrical current is conducted in the electrolytic cell. The cathode cylindrical pin and anode cylindrical pin in the plate correspondingly press against the ionic membrane, and the cathode net and anode net also tightly press against the ionic membrane after being pressed.

However, for the existing electrolytic cell, after being used for a period of time, the position of the pole net at the cross conductive claw will be sunken when being subjected to force, which may result in an uneven net surface, thus the cell voltage is generally high. The ionic membranes are vulnerable to damage due to the pulling of extrusion force and the unevenness of polar network.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the above disadvantage or at least partially solve or alleviate the above disadvantages.

In one aspect, the present invention provides an electrolytic cell cathode with zero polar spacing or gap comprising a conductive column, a cathode net connected to the conductive column, an elastic net covering the cathode net, a surface net covering the elastic net; a fixing or fastening part penetrating through the surface net, the cathode net and the elastic net and is fixed on the conductive column.

Optionally, the fixing or fastening part comprises a nickel spacing part, a spacing pin and a spacing cap, wherein the nickel spacing part is provided with a fixing hole; the spacing pin penetrating through the fixing hole and fixed with the nickel spacing part through the fixing hole and the spacing cap is connected with the spacing pin and covers part of the surface net.

Optionally, the materials of the spacing pin and the spacing cap are nonmetallic materials with high temperature resistance and corrosion resistance.

Optionally, the cathode of the electrolytic cell with zero polar spacing further comprises a support rib plate of which one end is connected with a cathode disc, and the other end is connected with the cathode net for supporting the cathode net.

Optionally, the support rib plate is L-shaped.

Optionally, the net is made from nickel.

Optionally, the elastic net is a wave-typed structure.

During the use of the electrolytic cell cathode provided by the invention, the elastic cathode is uniformly attached to the ionic membrane and reducing the shaking of the ionic membrane in the using process, and then the service life of the ionic membrane can be greatly prolonged. The elastic net with special structure can effectively prevent the elastic change caused by pressure fluctuation and keep the polar spacing relatively stable. In the process of discharging gas, bubbles can be broken and the resistance inside the electric tank can be reduced; the elasticity of the elastic net is better and more durable, and the current density is uniform.

The specific embodiments of the invention will be detailed described in conjunction with the following drawings, and the above and other purposes, advantages and features of the present invention will become more apparent to those skilled in the art.

BRIEF DESCRIPTION OF DRAWINGS

Some specific embodiments of the present invention will be described in detail hereinafter by way of the drawings, but not the limiting examples with reference to the drawings. The same reference numerals in the drawings may designate the same or similar components or parts. The skilled in the art should appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic diagram of the cathode film electrode spacing coating structure of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the nickel spacing and spacing cap;

FIG. 3 is a schematic structural diagram of the spacing pin.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The zero polar spacing technology for cathode is adopted in the electrolytic cells in order to solve the disadvantages of common higher voltage of the electrolytic cell, the reduced life of ionic membrane due to the pulling damage caused by extrusion force. In view of the above problems, this new invention proposes a zero polar spacing technology, aiming at improving electrolytic production efficiency and effectively reducing energy consumption. The specific technical scheme is as follows:

Referring to FIG. 1, in one embodiment of the present invention, the cathode of the electrolytic cell with zero polar spacing comprises a conductive column, a cathode net, an elastic net, a surface net, and a fastening part; wherein the cathode net is connected with the conductive column, the elastic net is covered on the cathode net, the surface net is covered on the elastic net, and a fastening part penetrating through the surface net, the cathode net and the elastic net and is fixed on the conductive column.

Referring to FIGS. 2-3 in one embodiment of the present invention; the fixing part comprises a nickel spacing pin, a spacing pin and a spacing cap. The fixing holes are arranged at fixed intervals for medium nickel. The spacing pin penetrates through the fixing hole and is fixed to the nickel spacing part through the fixing hole. A spacing cap is connected with the spacing pin and covers a part of the surface net.

In one embodiment of the invention, the spacing pin and the spacing cap are made from the nonmetallic materials which are high temperature resistant and corrosion resistant.

In one embodiment of the present invention, the cathode of the electrolytic cell with zero polar spacing or gap further comprises a support rib plate of which one end of which is connected with a cathode disc, and the other end is connected with the cathode net for supporting the cathode net. In this embodiment, the support rib plate is L-shaped (as shown by the L support in FIG. 1), but is not limited thereto.

In one embodiment of the present invention, the face net is made from nickel.

In one embodiment of the present invention, the elastic net is of a wavy structure.

According to the present invention, the cathode of the electrolytic cell is reformed in membrane electrode spacing, and an elastic net and a surface net are added, so that the height of the cathode electrode net needs to be adjusted. At the same time, in order to increase the strength of the bottom net and improve the compression resistance, an L-shaped support rib plate is added to the cathode. According to the calculated results, the supporting objects that meet the requirements are made of nickel.

The structure of the locating pin has been adjusted after modifying the cathode film pole, and the original locating pin (FEP+ nickel column) structure is no longer suitable for use. The original locating pin is made of FEP+ nickel column. When the temperature reaches to 90° C., the FEP will creep and cannot transmit force well. Therefore, the locating pin is now made of a material with higher temperature resistance and corrosion resistance. After the positioning pin with the current structure is adopted, the elastic net does not need to be welded on the pole net when the elastic net is coated, thus avoiding phenomena of wire breakage and the like during welding.

An elastic net is added to the cathode electrode net. The elastic net is made of nickel. The elastic net is superior in material and large in compression. The wave-shaped elastic net is conducive to the discharge of gas and fully cutting bubbles during the discharge process. The elastic net structure can reduce the vibration of the ionic membrane and prolong the service life of the membrane.

The surface net for cathode is made of special nickel wire. It has good toughness and strength, smooth and soft surface, and then will not damage ionic membrane.

The coating method of cathode film electrode spacing is as follows, the elastic net and the surface net are fixed by the spacing pins made of high temperature resistant and corrosion resistant materials, and fixed by coating the periphery. In the use process, the elastic cathode uniformly clings to the ionic membrane, so that may reduce the shaking of the ionic membrane in the use process, and greatly prolong the service life of the ionic membrane. The elastic net with special structure can effectively prevent the elastic change caused by pressure fluctuation and keep the polar spacing relatively stable. In the process of discharging gas, bubbles can be broken and the resistance inside the electric tank can be reduced. Then elastic net may acquire better and more durable elasticity, and the uniform current density.

After the electrolytic cell was reformed to zero polar spacing, the cell voltage significantly decreased.

The membrane breakage rate of an electric tank in one membrane cycle (about 4 years) before the renovation is at least 10 sheets, and no membrane breakage phenomenon presents after the renovation.

The distances L1, L2, L3 and L4 may be measured according to the formula of

La=L1+L2−L3−L4−Lb,

and then the height of the required support may be calculated according to the relevant standards of the electrolytic cell: Note: La means the height of L-shape support rib plate;

Lb means the clearance between rib plate and pole net;

L2 means the height of adjusting cathode grid; L3 means the height of pole net;

L1 means the height of conductive column; L4 means the height of cathode plate.

The above description is only a preferred embodiment of the present invention and shouldn't limit the scope of protection of the present invention. Any changes or substitutions that can easily occur to those skilled in the art within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined according to the claims. 

1: An electrolytic cell cathode with zero polar spacing, comprising: a conductive column; a cathode net connected to the conductive column; an elastic net covering the cathode net; a surface net covering the elastic net; and a fastening part penetrating through the surface net, the cathode net and the elastic net and fixed on the conductive column. 2: The electrolytic cell cathode with zero polar spacing according to claim 1, characterized in that said fastening part comprises: a nickel spacing part, wherein nickel spacing part is provided with a plurality of fixing holes; a spacing pin penetrating through the fixing hole and fixed on the nickel spacing part through the fixing holes; and a spacing cap connected to the spacing pin and covering part of the surface net. 3: The cathode of the electrolytic cell with zero polar spacing according to claim 2, characterized in that the spacing pin and the spacing cap are made of nonmetallic materials with high temperature resistance and corrosion resistance. 4: The electrolytic cell cathode with zero polar spacing according to claim 1, characterized in that the electrolytic cell cathode with zero polar spacing further comprises a support rib plate, one end of which is connected with a cathode plate, and the other end of which is connected with the cathode net for supporting the cathode net. 5: The electrolytic cell cathode with zero polar spacing according to claim 4, characterized in that the support rib plate is L-shaped. 6: The cathode of an electrolytic cell with zero polar spacing according to claim 4, characterized in that the material of the surface net is nickel. 7: The cathode of the electrolytic cell with zero polar spacing according to claim 4, characterized in that the elastic net is of a wavy structure. 8: The electrolytic cell cathode with zero polar spacing according to claim 2, characterized in that the electrolytic cell cathode with zero polar spacing further comprises a support rib plate, one end of which is connected with a cathode plate, and the other end of which is connected with the cathode net for supporting the cathode net. 9: The electrolytic cell cathode with zero polar spacing according to claim 3, characterized in that the electrolytic cell cathode with zero polar spacing further comprises a support rib plate, one end of which is connected with a cathode plate, and the other end of which is connected with the cathode net for supporting the cathode net. 